1Durable Constraction: This mini prism system with side bubble is a metal prism assembly that is powder painted fluorescent orange and fluorescent yellow targets. 2Accurate Measurement: Surveying prism is accurately inspected with glass, which enhances the prismatic reflective ability, with full texture, clarity and brightness for more accurate and durable measurements. 3Fully Equipped: This 25.4mm diameter copper coated prism for fog prevention also features a tilting holder with friction axes, zero or 30 mm offset. The prism includes an S hook and bracket for handheld work, a point for stake outs. 4Easy to Carry: This survey prism is very light, and you can bring surveying prism anywhere without any hassle. This prism is small, durable and easy to store. 5Widely Used: Mini prism reflector has a wide range of applications. Widely used in tunnels, subways, mines, highways, and other inspections, suitable for Leica. Item Type: Surveying Prism Material: Optical glass and aluminum alloy Constant: 0 or -30mm Effective Diameter: Approx.25.4mm or 1in Scope of Application: Detection of tunnels, subways, mines, highways, and applicable for Leica 1 x Surveying Prism 1 x U Shaped Frame 1 x Adapter 1 x S Hook 1 x Cover 1 x Storage Bag